When a human egg ovulates it arrests in metaphase II until it is fertilized by a sperm. How many chromosomes are present in the egg at metaphase II?
A. 46
B. 2 with sister chromatids still attached
C. 4
D. 23 with sister chromatids still attached
E. 1
D. 23 with sister chromatids still attached
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The average time it takes for actively dividing human cells to complete one cycle of division and growth, and be ready for another division, is about 24 hours
Given that there are 50-100 trillion cells in a human body, how long would it take to go from fertilized egg to the time the baby is born? A. 45.5 days B. 4.5 days C. 9 months
Physical and chemical barriers that form the first line of innate defense include
A. the acidity of the stomach. B. tear fluid from the eye. C. an unpunctured skin. D. mucus and cilia of the respiratory tract. E. All of the answer choices are correct.
After correcting for the noted deletion in slots 62-64, it becomes clear that mutations in the ________ triplet have the most effects on changes in phenotype
Fill in the blank(s) with correct word
Small, circular DNA molecules that are located outside the main chromosome of bacteria and are capable of self-replication are ________
Fill in the blank(s) with correct word