Teas science

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 AIDS virus enters the

cell?

•Reverse transcriptase, an enzyme encoded by the virus.

•The phospholipids found on the envelope of the virus.

•Receptor proteins located on the surface of the virus.

•The protein that makes up the capsid of the virus

Reverse transcriptase, an enzyme encoded by the virus.

Hikers who found a human body at high altitude in the Italian Alps thought the man had died recently, but tests indicated he was shot with an

arrow more than 5,300 years ago. Which of the following would be the best reason for prolonged preservation of the body?

The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found.

• The ultraviolet rays at such a high altitude caused all the body's molecules to be preserved.

• The arow wound caused blood to flow out of the body, which led the enzymes that would break down tisue to be cleared from the body.

• The food that the person ate contained toxins that kiled the bacteria that would have otherwise destroyed the body.

• The body was frozen in the cold temperature of the Alps shortly after he died and remained frozen until it was found

Which of the following is the function of a totipotent cell?

•Caries electrical impulses

• Fights infectious diseases

• Aids in the maturation of sex cels

• Develops into any kind of cell

Develops into any kind of cell

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

• Polarity of water molecules

High surface tension

High specific heat

• Kinetic energy of liquid water molecules

Polarity of water molecules

Which of the following indicates the function of sodium bicarbonate released by the pancreas?

•Sodium bicarbonate is a protease that digests carbohydrates.

• Sodium bicarbonate inhibits peristalsis.

• Sodium bicarbonate stimulates the pyloric sphincter.

Sodium bicarbonate neutralizes the acidity of chyme.

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

• Granzymes.

• Perforin

• Lysozymes.

• Cytokines

Cytokines

Testosterone is categorized as which of the following types of hormones?

• Androgen

• Aldosterone

• Estrogen.

• Progestin

Androgen

Which of the following are used to determine a person's DNA sequence?

• Genes

Blood types

Enzymes

Hormones

Genes

In a phase diagram, which of the following is the term used for a substance held at a temperature and pressure where the solid, liquid, and

gaseous states of a substance exist simultaneously?

Absolute zero.

Critical temperature

Triple point

• Critical point

Triple point

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?

Diffusion

Active transport

Facilitated diffusion

• Osmosis

Osmosis

Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

Carbon monoxide

Oxygen

• Carbonic acid

• Carbon dioxide

Carbonic acid