Which of the following is (are) true about cephalosporins?
A. They can be given to patients with penicillin allergies.
B. They, like penicillin, inhibit bacterial cell wall synthesis.
C. There are four generations of cephalosporins.
D. All of the choices are correct.
Answer: D
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Mendel called crosses involving two traits ____________________ crosses
Fill in the blank(s) with correct word
A population pyramid:
a. reflects the number of individuals in various age groups in a population. b. predicts survival and mortality rates for an individual at a given age. c. directly predicts future age distributions of the population. d. shows the current birth and death rates of a population.
Why is there no increase in the number of offspring produced by females that have access to additional males beyond the first?
a) The fertility window for female fruit flies is very short. b) Females only ever mate with one male. c) Females are limited in their access to males and so rarely come in contact with more than one. d) Females are limited in offspring production by the availability of male sperm. e) If a single male produces more sperm than the number of eggs produced by the female, access to more sperm does not result in more offspring.
When cells are not responding to normal controls over growth and division, they form a tissue mass known as a _____________.
A. metastasis B. malignancy C. tumor D. carcinogen E. nucleosome