In males, testosterone (select all correct choices):
A. directs the development of male
reproductive structures during
embryogenesis.
B. directs development of male secondary
sexual characters during puberty.
C. helps maintain adult health.
D. acts on Sertoli cells.
E. acts on Leydig cells.
A,B,C,D
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In which part of the nephron does filtration takes place?
A. Bowman's capsule B. glomerulus C. collecting duct D. Tubular part
Transcribed DNA sequences that are removed during mRNA processing are called ______________ Fill in the blank(s) with the appropriate word(s)
Which of the following human activities has contributed to an increase in the number of bacteria having R plasmids?
A) nitrogen fixation by genetically engineered plants B) improper use of restriction enzymes in research and medical facilities C) increased carcinogen exposure from excessive fossil fuel burning D) heavy use of antibiotics in medicine and in agriculture
A(n) ________ is a special type of lysosome used by a cell to selectively digest and recycle cytoplasmic contents, such as mitochondria.
A. autophagosome B. turnover lysosome C. recycling vacuole D. suicide vacuole