Which one of the following is not required for a plant to grow and reproduce?
A. hydrogen peroxide
B. carbon dioxide
C. water
D. light
E. basic nutrients
Answer: A
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Gorter and Grendel's classic experiment allowed them to observe that the erythrocyte plasma membrane contains _______ the surface area of the erythrocytes.
a. enough lipid to occupy a monolayer equal to b. enough lipid to occupy a monolayer equal to twice c. less lipid than would occupy a monolayer equal to d. enough lipid to occupy a monolayer equal to one-half
The technique known as ________ relies on the fact that although the PCR fragments are about the same ________, they differ in ________. The DNA denaturing rate on a gel then varies with the ________ content, DNA sequence, and chemical gradient. Hence, similar fragments can be separated and identified.
What will be an ideal response?
The number of generations it takes for an allele to become fixed or lost in a population depends on population size. There are three populations associated with the frequency of the ? allele and its change in frequency. Which population(s) show dramatic change in ? allele frequency and what are these changes? Population 1 = brown mouse (top line); Population 2 = middle line; population 3 =
white mouse (bottom line).
A. Population 1; it shows an extinction of the ? allele resulting in all brown mice.
B. Population 3; it shows an extinction of the ? allele resulting in all white mice.
C. Population 2; it shows an increase in the frequency of the ? allele after 50 generations.
D. Population 1; it shows a fixation of the ? allele resulting in all brown mice and Population 3 shows an extinction of the ? allele resulting in all white mice.
E. Population 1, 2, and 3 all show drastic changes in ? allele frequency after 50 generations, with the complete elimination of the ? allele in all three populations.
Which of the following statements about the Rh marker allele is most accurate?
a. The Rh marker results from a single gene with two alleles. b. An individual's red blood cells carry the Rh cell surface marker if they have one or two copies of the dominant Rh marker allele. c. If a person has one or two copies of the dominant Rh marker allele then their blood type is noted as "positive", that is, B+ or B positive. d. If an individual has two copies of the recessive allele for the gene, they do not have any Rh markers, and are therefore are described as "negative", that is, B- or B negative. e. All of the above