In vascular plants, water and dissolved minerals are transported from roots to the stems and leaves by ____
a. sclerenchyma
b. phloem
c. collenchyma
d. parenchyma
e. xylem
ANSWER: e
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Which of the following choices is an example of a positive feedback mechanism?
a. ceasing exercise when tired b. sweating when hot c. contractions in childbirth increasing production of oxytocin d. eating when hungry and stopping when full
A salt releases ions other than _____ in water
Fill in the blank(s) with correct word
Two bacterial strains have the same genes for metabolizing a carbohydrate, but one is wild-type for a regulatory inducer while the genetic variant does not produce the inducer. Which of the following statements is CORRECT with regard to the metabolic pathway enzymes?
A) The bacteria have the same phenotype. B) The bacteria have the same genotype but different phenotypes. C) The genotypes and phenotypes of the bacteria are the same. D) The bacteria are phenotypically the same but have different genotypes. E) The answer cannot be determined from the information provided.
Species A is divided by a newly formed river to become two populations. These populations diverge to become two different species, B and C. If the river is dammed upstream, eliminating an isolating mechanism between B and C, what will happen?
A) Species B and C will be considered subspecies. B) Gene flow will resume. C) Species B and C will remain genetically isolated. D) Species will unite to form a hybrid species, D.