I really can use some help to answer these questions

Question 1 of 20 5.0 Points

In prophase I of meiosis, a tetrad consists of:
 A. four different chromosomes 
 
 B. four chromatids 
 
 C. a pair of homologous chromosomes 
 
 D. Both b and c 
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Question 2 of 20 5.0 Points

Where is DNA located in a cell?
 A. cell membrane 
 
 B. nucleolus 
 
 C. cytoplasm 
 
 D. nucleus 
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Question 3 of 20 5.0 Points

In normal cells, tumor suppressor genes:
 A. cause the transformation of oncogenes into proto-oncogenes 
 
 B. induce the cells to differentiate into mature cell types with no growth potential 
 
 C. produce benign but not cancerous tumors 
 
 D. produce enzymes that cause oncogenes to be switched on 
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Question 4 of 20 5.0 Points

What causes mutations in proto-oncogenes and in tumor-suppressor genes?
 A. All of the above 
 
 B. viruses 
 
 C. inheritance 
 
 D. radiation 
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Question 5 of 20 5.0 Points

A spore-producing plant is called a(n):
 A. sporophyte 
 
 B. gametophyte 
 
 C. sporangium 
 
 D. gametangium 
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Question 6 of 20 5.0 Points

The process of meiosis always begins with what type of cell?
 A. asexual 
 
 B. diploid 
 
 C. vegetative 
 
 D. haploid 
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Question 7 of 20 5.0 Points

In which phase of mitosis do pairs of sister chromatids align in one plane at the center of the cell?
 A. metaphase 
 
 B. anaphase 
 
 C. telophase 
 
 D. prophase 
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Part 2 of 3 - 

Question 8 of 20 5.0 Points

Under certain conditions helpful bacteria on the skin can be infected by usually harmful 
 A. Protists 
 
 B. Yeast 
 
 C. Bacteriophages   
 
 D. Fungi 
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Question 9 of 20 5.0 Points

Why is it difficult to know whether a person acquired a herpes simplex infection?
 A. They cause acute disease 
 
 B. It is a latent virus 
 
 C. Herpes simplex does not cause disease 
 
 D. They cannot replicate in humans 
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Question 10 of 20 5.0 Points

What characteristic do all viruses have in common?
 A. They have a DNA genome 
 
 B. They consist of nucleic acid and protein 
 
 C. They have a nucleus 
 
 D. They possess organelles 
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Question 11 of 20 5.0 Points

Viruses can infect all of the following except:
 A. Bacteria 
 
 B. Eukaryotes 
 
 C. Algae 
 
 D. Other viruses 
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Question 12 of 20 5.0 Points

Mononucleosis is caused by the following virus:
 A. TMV 
 
 B. HTLV 
 
 C. EBV 
 
 D. RSV 
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Question 13 of 20 5.0 Points

Which of the following is not a role of normal microbiota:
 A. They secrete substances that destroy cells 
 
 B. They produce nutrients such as vitamin K 
 
 C. They prevent overgrowth of yeast 
 
 D. They thwart pathogenic bacteria 
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Question 14 of 20 5.0 Points

How do lysogenic viruses differ from lytic viruses?
 A. Lysogenic viruses assemble their manufactured “parts” into new viruses and lytic viruses do   
 
 B. Lysogenic viruses attach to host cell receptors and lytic viruses do not 
 
 C. Lysogenic viruses insert into the host cell’s DNA and lytic viruses do not 
 
 D. Lysogenic viruses enter into the host cell and lytic viruses do not 
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Part 3 of 3 - 

Question 15 of 20 5.0 Points

Which feature is not characteristic of cellular slime molds?
 A. Ameba-like cells 
 
 B. A moving mass called a slug 
 
 C. Form spores 
 
 D. Carry out photosynthesis 
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Question 16 of 20 5.0 Points

Sea kelp is an example of:
 A. Brown algae 
 
 B. Green algae 
 
 C. Dinoflagellate 
 
 D. Red algae 
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Question 17 of 20 5.0 Points

Which of the following is not a feature of the protists?
 A. Represent an important step in early evolution 
 
 B. Many are single-celled 
 
 C. Prokaryotic 
 
 D. Organelles 
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Question 18 of 20 5.0 Points

It is believed that aging in yeast may be due to the following:
 A. The accumulation of aging genes over time 
 
 B. A switch that causes genetic instability 
 
 C. A gene that causes the cell to pop its lysosomes 
 
 D. The buildup of cancer genes introduced by viruses   
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Question 19 of 20 5.0 Points

Which organism is not a protist?
 A. Slime mold 
 
 B. They all are protista 
 
 C. Algae 
 
 D. Fungus 
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Question 20 of 20 5.0 Points

Which of the following is not a characteristic of flagellates:
 A. A lack of cell walls 
 
 B. Cilia 
 
 C. Single nucleus 
 
 D. Simple cell structure