A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this
condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment?
A. Yes, because there is more than one variable.
B. Yes, because there is one variable and a control
C. No, because there is not more than one variable
D. No because there is only one variable and a control
B
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In DNA, complementary base pairing occurs between
a. cytosine and uracil. b. adenine and guanine. c. adenine and uracil. d. adenine and thymine. e. sugar and phosphate.
The organisms shown here are examples of _____
1.fruiting bodies of club fungi
2.diploid ascospores resulting from mitosis
3.branching haploid mycelium
4.a multicelled body consisting of fungus and an alga or bacterium
The human genome codes for 20,000 to 25,000 proteins, but any given cell might produce only 5,000 different proteins. How is this possible?
A) Not every cell has the machinery for transcription and translation. B) Genes are regulated so that not all genes are transcribed in all cells. C) Every cell contains a different fraction of the genome. D) All possible proteins are made in all cells, but those that are not needed are degraded. E) Some cells use introns to produce proteins, and some cells use exons.
The enzyme reverse transcriptase is found in which of the following viruses?
a) Rhinovirus b) Herpesvirus c) Filovirus d) Retrovirus