Both Streptococcus pyogenes and Corynebacterium diphtheriae are highly pathogenic, and the disease symptomology can be very severe. Why is this?
A. They induce autoimmune states in the patients.
B. There are no antibiotics useful for diseases caused by these bacteria.
C. Infants and children are the high-risk groups, and their mortality rate is higher than for other ages.
D. Both bacteria produce potent exotoxins.
Answer: D
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Suppose you discover a mouse that has spiky fur instead of the usual soft fur. You notice that this trait seems to be present only in males. To investigate this pattern, you cross a spiky-fur male with a soft-fur female, and find that all the F1 progeny of both sexes have soft fur. You then interbreed the F1 and observe that all the F2 females have soft fur, but 1/4 of the F2 males have spiky fur. You conclude that the spiky allele is
A) an X-linked recessive. B) Y-linked. C) autosomal recessive with sex-influenced expression. D) an X-linked dominant. E) an autosomal dominant with sex-influenced expression.
Glandular root-hairs of tomato plants secrete
aromatic chemicals to deter plant eating insects. What do these structures secrete from the cannabis plant? a. THC b. hydrogen peroxide c. latex d. phloem fluid e. sharp edged crystals
________ prey on autotrophs and do not kill the individuals they feed on
Fill in the blank(s) with correct word
Under the influence of antidiuretic hormone, you would expect to see an increase in ________
A) blood pressure B) sodium reabsorption C) urine volume D) plasma volume