Primates first appear in the fossil record in the:

A) Cenozoic era. B) Cambrian period. C) Paleozoic era. D) Mesozoic era.


Answer: A

Biology & Microbiology

You might also like to view...

Rowley Pharmaceutical company produces a drug that promotes new blood vessel growth. Is there any application for this drug in wound treatment?

A. It could be very beneficial-one of the biggest problems with wound infections is their largely anaerobic nature. The blood supply to the area is usually compromised, helping to create the anaerobic environment. Certain pathogenic microbes then thrive in this environment, creating very serious wound infections. B. It could be disastrous! Part of the reason abscesses lack blood flow is to keep toxins and bacteria from spreading to other areas of the body. Increasing blood flow to the area will provide a highway for these bacteria to seed other organ systems! C. It could be dangerous-wounds need to cut off blood supply to prevent the patient from bleeding to death. Increasing blood vessel development in the wound site might cause the patient to bleed out. D. There would be no beneficial effect-the immune response is already in place in the wound site, so increasing blood cell delivery to the area wouldn't increase or decrease the rate of wound healing.

Biology & Microbiology

__________ are cells that synthesize bone, whereas

__________ break bone down. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Choose the membrane molecule responsible for aiding passage of polar molecules into and out of the cell.

A. cell surface proteins B. transmembrane proteins C. carbohydrate chains D. phospholipids

Biology & Microbiology

The effect of a competitive inhibitor can be reversed by ____.

a) increasing inhibitor concentration b) heating the reaction mixture c) changing the pH d) massaging the enzyme e) increasing substrate concentration

Biology & Microbiology