The layer of cells that forms a barrier between the sperm and the egg is the corona radiata
Indicate whether the statement is true or false
TRUE
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This phylogeny shows the relationships among 53 modern humans based on mitochondrial DNA. How does this phylogeny support the out-of-Africa hypothesis?
What will be an ideal response?
Many cells of the immune system have receptors that detect peptidoglycans and lipopolysaccharides. How do pathogenic bacteria avoid detection?
A. Pathogenic bacteria lack cell walls. B. Pathogens often encase themselves in a gelatinous capsule. C. Peptidoglycans are absent from pathogenic bacteria. D. Disease is only possible if the immune system has been compromised by some other event. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about bacterial cell walls? How does it relate to the question? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In meiosis homologous chromosomes align next to one another during
A. interphase I. B. metaphase II. C. prophase I. D. metaphase I. E. prophase II.
Menopause is characterized by _____
A) the loss of responsiveness by the ovaries to follicle-stimulating hormone (FSH) and luteinizing hormone (LH) B) a decline in production of the gonadotropin hormones by the anterior pituitary gland C) wearing away of the uterine endometrium D) a halt in the synthesis of gonadotropin-releasing hormone by the brain