3. Not all cells have receptors for the molecule.
The main reason a signaling molecule is not receive by every cell nucleus is that not all cells have receptors for that particular molecule. Cells have specific receptors on their surface to recognize and respond to their corresponding signaling molecule. Cells that lack the specific receptors for a given signaling molecule will not respond to it, regardless of the size of the cell nuclei or other factors such as the stability of the molecule itself.
b. faults
c. large cities
d. the east coast of North America
the Answer is b. Faults
B. several distantly related species develop similarities.
C. a species evolves at a slow, steady pace.
D. a species has periods of little evolution interrupted by periods of rapid evolution.
Answer: The correct answer is-
C. a species evolves at a slow, steady pace.
Gradualism can be describesd as a pattern/ theory of evolution by which already existing species give rise to new species by means of slow/ gradual and steady changes instead of major and abrupt changes.
Over long period of time, the small changes (that are beneficial for their survival) result in new species.
Example- Tiger that is evolved pattern of stripes ( which give them better advantage to hide in tall grass).
Thus, option C) a species evolves at a slow, steady pace. is the right answer.
DNA contains the code for constructing the protein molecules in a cell of an organism. Thus, the correct option is A.
DNA stands for deoxyribonucleic acid. DNA is a polymer which is composed of two strands or chains of polynucleotide chains which coil around each other to form a structure called as double helix.
The nucleic acid polymer carries the genetic instructions for the development, functioning, growth and reproduction of all the known living organisms and many of the viruses. DNA and RNA are nucleic acids. DNA contains the cods for the construction of protein molecules.
Therefore, the correct option is A.
Learn more about DNA here:
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Your question is incomplete, most probably the complete question is:
DNA contains the code for constructing which molecules?
a. Proteins
b. fats
c. starch
d. sugars
Answer:
Explanation:
DNA are the building blocks of chromosome. Think about a blueprint. Blueprint contain instructions of how to build something, the actual instructions are the drawing and those drawings are housed on the blue paper.
So if you connect that analogy to this, DNA is actually the code that tells your cell how to do, what to do and such, they are actual genetic codes with bases such as Adenine, Guanine, Cytosine, and Thymine arranged in a double helix pattern. The chromosomes are the structures that are a result of arrangement of billions and billions DNA bases, thus they are the structures that house DNA and gene (part of DNA that codes for stuff)
moss → pea plant → firefly
firefly → pea plant → moss
pea plant → firefly → moss
Answer:
The correct answer is firefly → pea plant → moss.
Explanation:
Fireflies average life span is about 2 months for adults. Pea plants are annual plants and life span is of one year, it takes place from winter to the end of summer.
Moss life span is longer than pea plants and fireflies. Their life span depends on their species which can range from two to ten years. Generally, it considered as 10 years.
Thus, the correct answer is firefly → pea plant → moss.
Answer:
c. Firefly, peaplant, moss.
Explanation:
Fireflies live for only a couple weeks. Pea plants live for about 100 days. Moss lives for about 4 months.