Science Nine Chapter Four: Question Preview (ID: 4186)


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Proteins are made by
a) ribosomes b) nucleolus c) DNA d) chromosomes
What instructions do genes carry?
a) to make proteins b) to store genetic material c) to pass information from one generation to the next d) to determine whether a person will be born male or female
How many chromosomes to humans have?
a) chromosomes are too small to be counted b) 46 arranged in 23 pairs c) 92 arranged in 46 pairs d) between 90 000 and 100 000
The coate colour of the Spirit Bear is due to
a) change of the seasons b) global warming c) a mutated gene d) environmental stresses
Most mutations
a) are helpful to the organism b) are harmful to the organism c) have no effect on the organism d) can be fixed by an organism
Which type of mutation is beneficial to an organism and, therefore aids in the organism's ability to survive?
a) neutral b) positive c) negative d) deletion
Errors in the DNA that appear to neither harm nor help an organism are called
a) neutral b) positive c) negative d) substitutions
Which of the following is not a mutagen?
a) cigarette smoke b) radiation c) pesticides d) carbon dioxide
Which organelle produces ribosomes?
a) endoplasmic reticulum b) nucleolus c) mitochondrion d) vesicles
DNA stands for
a) Deoxyrubinuclidic acid b) Deoxyribonucleic acid c) Deoxynucleic acid d) Dioxyribonucleic acid
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