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
Answer: e. All of the above
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If you add the plant hormone auxin to one side of a plant, the cells exposed to the auxin elongate. If you measured auxin levels in plant cells exposed to light, what you would you expect to find?
A. They would be lower, causing the plant to bend away from the light. B. They would be higher, causing the plant to bend away from the light. C. They would be higher, causing the plant to bend towards the light. D. They would be lower, causing the plant to bend towards the light.
Which of the following has its primary effect on the brain's pain receptors?
A. adredocorticotropic hormone (ACTH) B. follicle-stimulating hormone (FSH) and luteinizing hormone (LH) C. endorphins D. oxytocin E. antidiuretic hormone (ADH)
DNA is found in association with proteins within the cell. What is the term for this DNA-protein complex?
A. chromatids B. centromere C. karyotype D. chromatin E. nucleus
A piece of silver can be cut indefinitely into pieces and still retain all of the properties of silver.
A) True. All particles, including subatomic particles that make up the element, possess the properties of the element. B) True. Atoms are the smallest units of matter, are indivisible, and possess the properties of their element. C) False. Once the pieces are smaller than an atom of silver, the pieces no longer retain the properties of silver. D) False. Silver atoms are too small to possess the properties of silver. E) False. As a piece of silver is cut into smaller pieces, the atoms begin to take on the properties of smaller elements.