In the first half of the menstrual cycle, estrogen primarily is secreted by the ______.

A. oocyte
B. corpus luteum
C. follicular cells
D. uterus


Answer: C. follicular cells

Biology & Microbiology

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The medical term for a collapsed lung is:

1.hemothorax 2.hydrothorax 3.planothorax 4.pneumothorax 5.brachiothorax

Biology & Microbiology

If the frequency of the recessive allele is 30 percent,

the frequency of the heterozygous carrier is what percent? a. 42 b. 9 c. 27 d. 60 e. 80

Biology & Microbiology

Speciation:a

maintains an intermediate phenotype in a stable environment. b. is the formation of a new species from an ancestral population. c. only occurs when a population is geographically isolated. d. is a change in allele frequencies in a population. e. is the end result of macroevolution but not microevolution.

Biology & Microbiology

All of the following pertain to cephalosporins except 

A. greater resistance to beta-lactamases. B. newer generations have activity against gram negatives. C. many administered by injection not orally. D. they have a beta-lactam ring. E. they are synthetic drugs.

Biology & Microbiology