In the first stage of the ovarian cycle, what gamete cell starts to develop?
a. polar body
b. primary oocyte
c. secondary oocyte
d. follicle cells
e. corpus luteum cells
b
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At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones. How can one hormone, such as estrogen, mediate so many
effects? A) Estrogen is produced in very large concentration by nearly every tissue of the body. B) Each cell responds in the same way when steroids bind to the cell surface. C) Estrogen is kept away from the surface of any cells not able to bind it at the surface. D) Estrogen binds to specific receptors inside many kinds of cells, each with different responses. E) Cells metabolize steroids in different ways, producing by-products that stimulate tRNA production.
Clonal libraries used to determine the sequence of a microbial genome using the whole-genome shotgun approach are typically generated by
A. cloning large DNA fragments produced by breaking chromosomal DNA with ultrasonic waves. B. cloning large DNA fragments produced by restriction endonuclease cleavage. C. cloning small gene sized DNA fragments produced by breaking chromosomal DNA with ultrasonic waves. D. cloning random PCR fragments amplified from genomic DNA.
A severe and life-threatening drop in blood pressure is known as ____
a. circulatory shock b. hypotension c. orthostatic hypotension d. primary hypertension e. secondary hypertension
Small hairlike structures made up of protein on the surface of bacteria are called:a
capsids. b. fimbriae. c. chromatids. d. plasmids. e. virons.