Deuterostomes evolved during the ____ eon

a. Cambrian
b. Proterozoic
c. Paleozoic
d. Cenozoic
e. Devonian


b

Biology & Microbiology

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Taxol, a drug treatment for breast and ovarian cancer, was isolated from ____

a. frog skin b. vascular cambium of a tree c. roots of a tree d. insects e. primates

Biology & Microbiology

When considering time and temperature as factors in microbicidal activity,

A. time is not a factor, only temperature. B. they are inversely proportional to each other. C. they are directly proportional to each other. D. they must be of equal value e.g. 30 minutes at 30°C.

Biology & Microbiology

What is the role of the SRY gene in humans?

A. None of the answers is correct. B. It is located on the Y chromosome and initiates the developmental pathway toward the male phenotype. C. It is located on the X chromosome and causes the X to pair with the Y chromosome during male meiosis. D. It is located on an autosomal chromosome and represses expression of autosomal genes in order to balance their expression level with genes on the X chromosome. E. It initiates the X inactivation process in females.

Biology & Microbiology

Which choice below correctly matches organelle with function?

A) smooth endoplasmic reticulum–lipid production B) lysosome–energy generation C) cytoskeleton–recycling of materials D) mitochondria–food generation

Biology & Microbiology