Question

question 17 (1 point) ✔ saved
from the one strand noted, identify the palindromic sequence below.
gaattc
gcat
ttagaa
tagat
question 18 (1 point) ✔ saved
all of the following are true regarding eukaryotic chromosomes except
the dna is tightly coiled around histone proteins.
the chromosomes are located in the nucleoid.
chromosomes vary in number from a few to hundreds.
chromosomes can occur in pairs or singles.
question 19 (1 point) ✔ saved
bioengineered hormones, enzymes, and vaccines are easier to produce but not as safe as their natural equivalents.
true
false

Explanation:

• Question 17: A palindromic sequence in DNA reads the same forwards and backwards on complementary strands. For GAATTC, the complementary strand is CTTAAG. Reading GAATTC from 5' - 3' and its complement from 3' - 5' (which is equivalent to reading the complement strand in 5' - 3' direction as CTTAAG reversed is GAATTC). Other options like GCAT (complement is CGTA, not palindromic), TTAGAA (complement is AATCTT, not palindromic), and TAGAT (complement is ATCTA, not palindromic) do not meet the palindromic criteria.
• Question 18: In eukaryotes, DNA is coiled around histones, chromosome numbers vary (e.g., humans have 46, some plants have more), and chromosomes can be in pairs (diploid) or singles (haploid in gametes). But the nucleoid is a feature of prokaryotes (where DNA is located), while eukaryotic chromosomes are in the nucleus.
• Question 19: Bioengineered hormones (e.g., recombinant insulin), enzymes, and vaccines (e.g., recombinant hepatitis B vaccine) are often easier to produce (through techniques like recombinant DNA technology) and are as safe (or even safer in some cases due to reduced risk of contamination from animal - based sources) as natural equivalents.

Answer:

• Question 17: GAATTC
• Question 18: the chromosomes are located in the nucleoid
• Question 19: False