During translation which molecule is formed?
a. DNA
b. mRNA
c. tRNA
d. proteins
e. ribosomes
ANSWER: d
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How many individual phospholipids are visible in the displayed section of a simple lipid bilayer?
a. 10 b. 20 c. 30 d. 40
This bacterium is the leading cause of human
bacterial disease and some strains are resistant to a wide range of antibiotics. This bacterium is
a. Clostridium tetani b. Corynebacterium diphtheriae c. Escherichia coli d. Staphlococcus epidermidis e. Staphlococcus aureus
Ornithosis, caused by ________, is usually a pneumonia-like disease but can sometimes lead to hepatitis or endocarditis.
A. Chlamydia trachomatis B. Chlamydophila pneumoniae C. Chlamydophila psittaci D. Rickettsia prowazekii E. Orientia tsutsugamushi
These two figures illustrate two lineages with two variants, with and without a black spot. In all situations, a split illustrates the descendants of an individual. In which situation can natural selection work?
a. In the diagram on the left, because natural selection has eliminated the spotted variant. b. In the diagram on the left, because the number of offspring produced is independent of muta-tion. c. In the diagram on the right, because variation is heritable. d. In the diagram on the right, because mutation does not influence reproduction.