science teas part 1

which of the following is the appropriate threshold value for mammalian neurons ?

-55mv

Which of the following structures is present in both prokaryotic and eukaryotic cells?

cell membrane

which of the following could lead to a tsunami?

earthquake

which of the following are used to determine a peersons DNA sequence ?

genes

which of the following organic molecules contain both an amine and carboxyl group?

proteins

osteoprosis results from

a decline in osteoclast activity but osteoblast remains at expected levels

which of the following is released by one type of immune cell to directly activate another type of immune cell?

cytokines

the measurement indicated by the line across the centre of the cell is

diameter

which of the following properties of water explains its solvent abilities for certain substances?

polarity of water molecules

which of the following vessels carries oxygenated blood?

pulmonary veins

which of the following is a mass with the ovary that secretes hormones to maintain the uterine lining during pregnancy?

corpus luteum

separate genomic DNA fragments by size , which of these laboratory methods is most useful ?

electrophoresis

in a plant in which fuzzy leaves (F) are dominated over smooth leaves (f), which of the following crosses will produce only offspring with smooth leaves?

ffxff

which of the following physiological responses is caused by the release of anti-diuretic hormones?

increase in water reabsorption in the collecting ducts

which of the following is the atomic number that has 12 protons and 12 neutrons?

12

which of the following glands synthesizes anti-diuretic hormone?

hypothalumus

which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?

ovulation

which of the following reasons explain why it is important for new scientific findings to be published?

other scientists can validate or disapprove the findings

which of the following is responsible for donating H+ ions to act as a buffer when blood ph rises ?

carbonic acid

which of the following is the structure through which blood exits the glomerulus ?

efferent arteriole

which of the following is the function of the totipotent cell?

it develops into any kind of cell

which of the following statements best supports the hypothesis that viruses can cause cancer?

genes that regulate cell division are found in some viruses

On a phase diagram, what is the triple point?

It is the temp and pressure at which all 3 phases of a substance exist simultaneously

which of the following microorganisms lack their own metabolic pathways and can reproduce inside a host cell?

viruses

in a phase diagram, which of the following is the critical point

it is the temp and pressure at which the liquid and gas phases of a substance merge together into a single phase

which of the following indicates the function of sodium bicarbinate released by the pancreas?

sodium bicarbonate neutralizes the acidity of chime

which of the following types of cells produce and release antibodies ?

plasma B cells

Cytoskeleton is composed of

proteins

which of the following summarizes a change that takes place as a solid turns into a liquid?

particles become less ordered

which of the following are specific immune responses?

-T lymphocyte activation and clonal expansion
-The formation of memory B cells
-Complement proteins binding to and destroying bacteria

which of the following is the main function of centrosomes in animal cells?

microtubule organization

testorene is organized as which hormone

androgen

Two major parts of the nervous system

central and peripheral

nitrogen gas is extremely stable because its structure contains which of the following?

triple covalent bonds

which of the following best describes the result of using a catalyst in a chemical reaction

the reaction is completed in a shorter amount of time

what protects the skin from UV radiation ?

melanin

In a hypertonic solution, water flows through aquaporins embedded in the plasma membrane of the cell. This type of transport is best known as which of the following?

osmosis

which of the following is a group that can be measured against the experimental group?

control

a myacardial infarction affect which of the following blood vessels of the heart?

coronary artery

which of the following processes caused most of the carbon dioxide from the blood to most into alveoli ?

diffusion down a concentration gradient

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

urea

Lithium has an atomic number of 3 and a mass number of 7.
-
Which of the following is the number of protons in a lithium atom?

3

which of the following allows the AIDS virus, which contains RNA to insert viral DNA into the DNA of a host T cell after the virus enters the cell?

- Reverse transcriptase, an enzyme encoded by the virus.

a patients urine output was 800ml/hr, following a treatement, the pt's urine output increased to 1200ml/hr. what is the percentage change ?

50%