Using your knowledge of the feedback loops of
human female hormones, which of the following
results from high levels of estrogen and progesterone
in the blood?
a. lack of growth of the corpus luteum
b. absence of monthly ovulation
c. increased secretion of FSH
d. increased levels of LH
e. all of these
Answer: b
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Following uptake, transforming DNA becomes attached to a competence-specific protein that prevents it from nuclease attack until it reaches the chromosome
Indicate whether the statement is true or false.
Agricultural workers and field archaeologists are exposed to this organism which, despite entering via the respiratory tract, can cause meningitis.
A. Neisseria meningitidis B. Cryptococcus neoformans C. Coccidioides immitis D. Haemophilus influenzae E. Streptococcus pneumoniae
An operon is:
a. a molecule that can turn genes on and off. b. an inducer bound to a repressor. c. a series of regulatory sequences controlling transcription of protein-coding genes. d. any long sequence of DNA. e. a promoter, an operator, and a group of linked structural genes.
The following picture is a _________ section of brain. (Cut down the middle line)
a. coronal b. sagittal c. horizontal d. none of the above