science

which of the following is the primaryf unction of red blood cells

carrying oxygen to other body cells

which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia ?

urea

which of the following number of electrons are found in a boron atom with atomic number of 5 and a mass number of 11 ? yugiu

5

which of the following is classified as the long bone?

tibia

a person hyperventilates if the blood level of which of the following dissolved gases is abnormally low?

carbon dioxide

which of the following is the term for the gap between two nerve cells?

a synapse

which of the following structures is present in both prokaryotic and eukayotic cells ?

cell membrane

which of the following membranes is associated with the skin

cutaneous

which of the following cellular processes produce gametes?

meiosis

which of the following best describe protection from antigens due to passive immunity ?

a mother passes antibodies to her child through breast milk.

A researcher is comparing the surface areas of the following cells under a microscope a red blood cell,a neuron, a muscle cell, and a bacteria cell. which of the following has the smallest surface area ?

bacterial cell

a scientist observes that a particular species of insect becomes more active in higher temperatures particularly in the late afternoon. the scientist hypothesizes that this increased activity due to decreased predation, as many of the insets predators are less active when temperature rise.

which of the following pieces of evidence would be best support the scientists hypothesis ?

the number of predators observed in the area in significantly lower in warmer weather.

which of the following solutions below has molarity of 1 M

53.6 g of NH4CL in 1 L of water

which of the following is the primary contributer to skin color

Melanin

which of the following would increase the rate of an endothermic reaction ?

increasing the concentration of products

urea is derived from which of the following?

breakdown of amino acids in the liver

which of the following statements is an example of a positive feedback loop?

Uterine contractions strengthen, causing the release of more oxytocin

which of the following conditions results in faster heartbeat?

increased sympathetic nerve output

which of the follwowing is the neurotransmitter that causes skeletal muscle contraction?

Acetylcholine

which of the following best explains why the pressure exerted by carbon dioxide on the walls of a sealed container increases when dry ice sublimates

Gas CO2 particles occupy more space

The insulating sheath that facillitates rapid movement of the action potential down the axon is known as which of the following?

Myelin

which of the following substances is excreted by sweat glands in response to the break down of proteins and the formation of ammonia?

Urea

Which of the following processes causes most of the carbon dioxide from the blood into the alveoli?

Diffusion down a concentration gradient

Free ears in dogs are controlled by the dominant allele (F), and attatched ears are controlled by the recessive alle (f). in addition short hair in the dogs is due to a dominant allele (S), and the long hair is due to recessive allele (s). Which of the following is the genotype of a dog with attatched ears and short hair ?

FfSs

The system of interconnected tubes involved in protein production is called

rough endoplasmic reticulum

which of the following parts contain cells targeted by antidiuretic hormones (ADH)

B

Which of the following describes the most important reason for repeating an experimental investigation?

to verify the validity of the original findings

which of the following is correct regarding the pH scale?

a substance with pH of 3 is 10 times more acidic than a substance with a pH of 4.

Which of the following types of chemical bonds are responsible for forming the primary structure of proteins?

Peptide bonds

Parasitic worm infestation is hypothesized to be damaging to the host. However, scientists have recently discovered that worm infestation can relieve the effects of certain autoimmune disorders. In which o the following ways should the hypothesis be modified, given the new findings?

Worm infestation reduces the severity of the certain autoimmune disorders.

Which of the following microscopes would be best suited for observing the surface structures of a virus particle?

Scanning electron microscope

supplemental amino acids can be given intravenously too preterm infants to stimulate growth. By which of the following direct mechanisms might these supplemental amino acids help promote growth?

The supplemental amino acids are used to make proteins.

Which of the following conclusions can be made from the information in the bar graph?

The highest activity rate for enzyme A occurs at a pH between 2 and 3.

Which of the following types of muscle tissue is responsible for peristalsis in the sigmoid colon?

Smooth

List the number of protons, Neutrons, and electrons for an anion with negative 3 charge if the neutral atom has an atomic number of 15 and atomic mass of 31.

15 protons, 16 neutrons, 18 electons.

Which of the following question is the student most likely investigating?

What effect does cooling have on the solubility of different solutes?

If an atom has one valence electron, which of the following characteristics will it exhibit when reacting with other elements?

It is likely to lose one electron to from a positive ion.

Why do enzyme catalyzed reactions slow significantly at excessively high temperatures?

The enzyme lowers the activation energy to an unfavorable level.

Which of the following statements describes how bile salts aid during digestion?

decrease the size of fat droplets to aid in digestion.

which of the following levels of organization is considered the simplest living unit?

cells

Which of the following structures connects the bladder to the outside of a womans body ?

urethra

An individual cell is able to make copies of its genetic information but is unable to produce encoded proteins. This indicates a possible problem with the

ribosome

An infection caused by a unicellular microorganism that posseses a nucleus and cillia indicates that type of pathogen?

protozoa

which of the following plans divides the body into left and right halves?

sagital plane

a researcher is investigation solubility and uses a scale in grams per cubic meter. During the analysis, they realize their data needs to be presented in kilograms per cubic meter. What steps should the researcher take to accurately convert their solubility values?

divide by 1000

which of the following statements correctly describes a solution with a pH of 10?

The solution has a hydroxide ion concentration of 10-4

Mammalian catalase will break down hydrogen peroxide into water and oxygen. one millimeter of catalase is added to a. beaker containing 200ml of hydrogen peroxide. which of the following scenarios would cause an increase in the rate of the reaction?

Place the beaker of catalase and hydrogen peroxide in a warm water bath.

Which of the following graphs should the editor use to best present this information and show overlap between different types of organisms>

Venn diagram

The destruction of which of the following pancreatic cells results in type 1 diabetes mellitus or insulin dependent diabetes?

Beta cells

Which of the following describes the relationship between fish gill openings and temperature?

As temperature increased, fish respiratory rate increased and then decreased

In a normal cardiac conduction system, which of the following structures generates electrical impulses?

SA NODE

An experiment is performed to see if applying fertilizer to rose bushes increases the number of flowers on the rose bushes. Which of the following best states the hypothesis for this experiment?

fertilizer will increase the number of flowers on the rose bushes.

Which of the following chemicals is necessary for the action of photoreceptor rod cells?

rhodopsin

Which of the following will happen if the brain is exposed to rapidly increasing salt concentrations?

Water leaves the nerve cells, leading to nerve cell creation.

Which of the following processes causes most of the carbon dioxide from the blood to move into the alveoli?

Diffusion down a concentration gradient

In which of the following kidney structures does filtration begin?

Glomerular capsule

0 c

Which of the following molecules acts as a messenger that carries genetic information from the nucleus to ribosomes?

RNA

Which of the following is an example of a noninfectious disease?

cystic fibrosis

Which of the following occurs as a result of acetylcholine being released into the neuromuscular synapse?

An action potential is generated along the sarcolemma of the muscle fiber.

In which of the following structures of the respiratory system does most gas exchange between the circulatory and respiratory systems occur?

Alveoli

A new drug to regulate heart rate was tested on laboratory rats over a 24-hour period. As the drug concentration increased from 0 to 1 0 mg/mL, the average heart rate decreased until it plateaued at 8 mg/mL. Which of the following scientific explanations is best supported by the data?

Increasing the drug concentration beyond 8 mg/mL has no further effect on heart rate.

A doctor explains that a patient has pulled a muscle in his back. Which of the following muscles could have been injured in the patient's back?

latissimus dorsi

A DNA strand has the sequence 5'A-C-A-G-C-C-G-T-A-A-A 3'. Which of the following is the sequence of its complementary strand?

3'T-G-T-C-G-G-C-A-T-T-T 5'

A research group examined whether the presence of different gut bacteria affected the ability of honeybees to survive a pathogen infection.

Following pathogen infection, the honeybees were treated with either Bacteria J or Bacteria K. For a control, some honeybees had no bacterial treatment after pathogen infection. Based on the graph, which of the following is a possible conclusion of the results?

Bacteria j treatment had the greatest positive effect on survival rate.

If a portion of a strand of DNA bases reads 5 ' AGCTAGCT 3', what would the sequence of bases on the complementary strand read?

3'TCGATCGCA 5'

Which of the following would occur as a result of increased secretion of erythropoietin (EPO)?

Oxygen levels decrease in tissues.

Benzene has a density of 0.88 g/mL while water has a density of 1.00 g/mL. They are immiscible with each other. If they are stirred together and allowed to rest, which of the following statements would be true?

"An equal amount of water and benzene will show a layered product with benzene on top."

In a muscle fiber that is depleted of ATP, which of the following will happen to the power stroke?

Myosin heads will not detach from actin.

A true-breeding blue-flowered plant (BB) i s crossed with a true-breeding white-flowered plant (bb). Which of the following genotypic ratios (BB:Bb:bb) would result?

25:50:25

Which of the following correctly identifies the hormone and secretory cells that are responsible for lowering blood glucose levels?

Insulin secreted by B cells

Metabolism is known as which of the following types of respiration?

cellular

Which of the following is a macroscopic component of the genitourinary system?

ureter

Which of the following substances is secreted by the parietal cells in the stomach?

Hydrochloric acid

Which of the following chemical formulas is correct based on the valences of the constituent elements?

Mg3N2

Sulfur has an atomic number of 16 and an atomic mass o f 32. I n the sulfide ion (S2), which of the following lists correctly represents the number of protons, neutrons, and electrons?

16 protons, 16 neutrons, 18 electrons

Which of the following statements is a testable hypothesis?

Walking 3 miles per day will lower average blood pressure.

Which of the following structures is classified as an exocrine gland?

Mammary gland

Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia? hyg

urea

Which of the following microscopes would be used to produce the following image of a blood clot?

Scanning electron microscope ohi

Which of the following is a hormone produced by the corpus luteum that is necessary for implantation?

Progesterone

Which of the following structures is part of the axial skeleton?

skull

Which of the following i s part of the peripheral nervous system?

Afferent neurons

During an observational study on birds, researchers propose that beak length affects the birds' ability to obtain food and survive. Which of the following places of evidence would best support the researchers' hypothesis?

Birds with longer beaks are better at accessing food hidden deep within flowers.

An example of active immunity is the transfer of

• antigens through vaccination.

Which of the following is a response to the release of antidiuretic hormone (ADH)?

water reabsorption increases at the collecting duct.

Which of the following monomers has buffering capacity due to the presence of both a positive and a negative functional group?

Amino acids

The data in the table shows which of the following?

When H' concentration is low, the pH is high.

Which of the following is the best way to preserve a piece of fresh meat from decomposition?

Place the meat in a pressurized container.

When salt (NaCI) is added to water, it disassociates into Na" and Cl ions. Which of the following types of chemical bond is present in a salt molecule?

ionic bond

A plant breeder is working with pea plants. They know that the allele for purple flowers (P) i s dominant to the allele for white flowers (p). They observe a plant with purple flowers and decide to determine its genotype. To do this, they cross-pollinate this plant with another plant that has white flowers (pp). Which of the following outcomes in the offspring would indicate that the purple-flowered parent plant is homozygous?

All offspring have purple flowers.

Which of the following explains the results of a Gram stain?

Gram-positive bacteria contain a thick peptidoglycan layer and stain purple.

Which of the following is a touch receptor in the skin?

Merkel cells

which of the following features characterizes a scientific argument?

Makes predictions that can be tested experimentally

Which of the following options describes the pattern of atomic radil within a group (column) moving from top to bottom in the periodic table?

increases

During a study o f various animals, researchers measured the brain-to-body mass ratio to evaluate cognitive abilities across species. The table shows the ratios measured for several species. Which of the following animals has the largest brain mass compared to its body mass?

human

The body temperatures for a mouse are shown in the table. If a

medication is injected at a temperature corresponding to normal human body temperature, at which of the following times should the medication be administered?

12 a.m.

Which of the following number of electrons are found in a boron atom with an atomic number of 5 and a mass number of 11?

5 u

S and O are in the same periodic group and share chemical properties, but H2S is a gas at room temperature, and H2O is a liquid. Which of thefollowing is the main reason for this?

H2O has stronger intermolecular bonds than H2S.

Which of the following glands produces an oily substance that lubricates the hair and skin?

Sebaceous