Question

1. what if no stop codon in rna transcription?

a. rna adds amino acids endlessly
b. dna produces infinite rna
c. continuous rna creation
d. infinite codon addition

1. which supports asexual reproduction advantage?

a. all mutations passed to child
b. identical dna passed from one parent
c. long time to reproduce
d. only in specific environments

1. what is correct about binary fission in bacteria?

a. daughter cells genetically identical
b. nucleus divides first
c. genetic recombination occurs
d. partial chromosome copied

1. dna bases include:

a. uracil
b. cytosine
c. adenosine
d. adenine
e. guanine

1. what mutation causes sickle cell anemia?

a. substitution
b. insertion
c. deletion
d. silent mutation

1. what does deletion mutation do?

a. changes amino acids, alters proteins
b. decreases genes coding for proteins
c. increases amino acids
d. prevents unique proteins

1. which process produces genetically identical bacterial cells?

a. binary fission
b. meiosis
c. mitosis
d. sexual reproduction

Explanation:

• Question 7: Stop codons signal the end of translation. Without them, ribosomes will keep adding amino - acids to the polypeptide chain endlessly.
• Question 8: Asexual reproduction involves only one parent, and the offspring have identical DNA to the parent, which is an advantage in stable environments.
• Question 9: In binary fission of bacteria, the parent cell divides into two genetically identical daughter cells. Bacteria are prokaryotes and do not have a nucleus, and there is no genetic recombination as in sexual reproduction.
• Question 10: The four bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G). Uracil is in RNA instead of thymine. Adenosine is a nucleoside, not a base.
• Question 11: Sickle - cell anemia is caused by a point mutation where a single nucleotide substitution occurs in the gene for hemoglobin.
• Question 12: Deletion mutations involve the loss of one or more nucleotides in the DNA sequence. This can change the reading frame of the genetic code, leading to changes in the amino - acid sequence and altering proteins.
• Question 13: Binary fission in bacteria results in two genetically identical daughter cells. Meiosis is for sexual reproduction in eukaryotes and leads to genetic variation. Mitosis in eukaryotes also produces genetically identical cells but is not the process in bacteria. Sexual reproduction leads to genetic variation.

Answer:

1. A. RNA adds amino acids endlessly
2. B. Identical DNA passed from one parent
3. A. Daughter cells genetically identical
4. B. Cytosine, D. Adenine, E. Guanine
5. A. Substitution
6. A. Changes amino acids, alters proteins
7. A. Binary fission