Which of the following types of bacterial cells would have flagella located at only one end of the cell?
a. Monotrichous and amphitrichous
b. Lophotrichous
c. Amphitrichous
d. Monotrichous
e. Lophotrichous and monotrichous
f. Peritrichous
Answer: e. Lophotrichous and monotrichous
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Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and allowed to replicate for 2 generations. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band B. one light band C. one half-heavy (intermediate to heavy and light) band D. one heavy and one half-heavy band E. one light and one half-heavy band
Which chordate trait evolved first?
A) Calcium-hardened skeleton B) Amniotic egg C) Four limbs D) Skull and backbone
In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone. Why?
A. Individuals with two harmful alleles have an advantage over individuals with two normal alleles. B. Heterozygous individuals have an advantage over individuals with two normal alleles. C. Individuals with two normal alleles have an advantage over heterozygous individuals. D. Individuals with two harmful alleles have an advantage over heterozygous individuals.
All of the following are correct EXCEPT:
a) The first law of them odynamics states that energy can never be created or destroyed b) the second law of thermodynamics states that every conversion of energy is not perfectly efficient and includes the transformation of some energy into heat c) heat is one of the most useful forms of energy to living organisms