Steroid hormones, such as testosterone and estrogen, are polar signaling molecules
a. True
b. False
ANSWER: False
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Which of the following organisms best describes a catalase-negative, gram-positive coccus that is hemolytic on sheep blood agar, and bacitracin positive?
a. Streptococcus pyogenes b. Streptococcus pneumoniae c. Staphylococcus epidermidis d. Micrococcaceae spp.
Hairlessness in dogs is inherited from a single dominant allele. Inheriting two dominant alleles is lethal for an embryo. Penelope, a hairless dog mates with Arnold, a dog with hair. The probability Penelope will have hairless puppies is
A) 3/4. B) 2/3. C) 1/4. D) 1/2.
Humans are an example of __________ species
a. a genetic b. an ecological c. a morphological d. a biological e. an evolutionar
The mechanism by which gram-negative bacteria can cross the blood-brain barrier?
a. Producing fimbriae b. Inducing endocytosis c. Producing toxins d. Inducing TNF e. All of these