The two strands of a DNA double helix are said to be antiparallel. This means that ____
a. the 5' end of one strand is directly paired with the 5' end of the other strand
b. since the double helix twists, it is not perfectly parallel
c. one strand has a negative charge and the other strand has a positive charge
d. the 5' end of one strand is directly paired with the 3' end of the other strand
e. both strands have a negative charge
ANSWER: d
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Agricultural lands frequently require nutrient augmentation because _____
A) nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides B) the nutrients that become the biomass of plants are not cycled back to the soil on lands where they are harvested C) land that is available for agriculture tends to be nutrient-poor D) grains raised for feeding livestock must be fortified, and thus require additional nutrients E) cultivation of agricultural land inhibits the decomposition of organic matter
In cats the allele B produces black, whereas b
produces yellow. Neither gene is dominant, and in the heterozygous state the phenotype is a combination of yellow and black spots called tortoiseshell. The alleles B and b are X-linked. If a tortoiseshell cat has three tortoiseshell kittens and two black kittens, give the genotype and phenotype of the tomcat that produced them, and give the sex of the kittens. What will be an ideal response?
The bronchi and bronchioles leading to the lungs have an effective mechanism for trapping incoming microbes. This method consists of
A. airborne antibodies. B. roaming patrols in the airways. C. mucus and cilia. D. bacteriolytic enzymes.
What is the basis of natural selection?
A. a change in the appearance of a species over time B. individuals passing on their traits to their offspring C. unequal reproductive success D. the accumulation of favorable traits in a population