One characteristic of life and living systems is that they are able to adapt. In general, cells interact with other cells and their environment through the action of their _____
A) plasma membrane and extracellular matrix
B) microtubular tracks
C) hormones
D) intracellular electrical currents
Answer: A
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Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This ratio suggests that _____
A) the parents were true-breeding for contrasting traits B) the particular trait shows incomplete dominance C) a blending of traits has occurred D) the parents were both heterozygous for the particular trait E) each offspring has the same alleles for each of two different traits
During the follicular phase of the menstrual cycle, a number of events occur which are listed below. Select the answer that places the events in the correct chronological order
Events: 1. the lining of the uterus thickens 2. granulosa cells secrete estradiol 3. FSH acts on granulosa cells 4. LH levels surge rapidly then decline 5. ovulation occurs A. 3, 2, 1, 4, 5 B. 3, 1, 2, 4, 5 C. 1, 2, 3, 4, 5 D. 2, 4, 3, 1, 5 E. 4, 3, 2, 1, 5
Transgenic plants produced by biotechnology contain fewer introduced genes than altered plants obtained by traditional breeding methods
a. True b. False Indicate whether the statement is true or false
A carrier of an X-linked recessive trait who expresses the phenotype is called a(n)
A) manifesting homozygote. B) manifesting mutant. C) manifesting heterozygote. D) imprinting heterozygote.