A change in which of the following is least likely to impact primary productivity?

The region of a Drosophila embryo with a low concentration of bicoid protein will develop into the _____. a) abdomenb) male flow

joja [24]

Answer:

The correct option is d) head.

Explanation:

Bicoid protein works as a transcription factor. It enters the nuclei of the embryos in early segmentation, where it activates the hunchback gene. In Drosophila, embryonic development begins at the time of fertilization. The sperm enters the mature oocyte through the micropile, a structure located in what will be the anterior region of the egg. Bicoid and hunchback mRNAs, protein products are critical for the formation of the head and thorax. Already in the early stages of oocyte development, certain mRNAs are located in specific regions of the oocyte: mRNA molecules encoding the Bicoid protein are preferentially located in the anterior region of the oocyte. Moderate levels of the bicoid protein are necessary to activate the formation of the thorax (i.e., the expression of the hunchback gene) but the formation of the head requires high concentrations of Bicoid, the promoters of a specific gap gene of the head must have sites of low affinity binding for Bicoid, so that this gene can be activated only in extremely high concentrations of Bicoid.

The lack of Bicoid protein affects the formation of the head and other structures in the anterior region of the oocyte.

6 0

3 years ago

What was known before Franklin and Wilkins conducted their studies of DNA? Check all that apply. DNA is found in the nucleus of

kvasek [131]

Answer:

The correct answer will be-

1. DNA is found in the nucleus of a cell

2. Organisms store and transmit genetic information

3. Cells contain protein molecules.

Explanation:

The study of DNA started much before the discoveries of Rosalind Franklin and Maurice Wilkins.

Nucleus of cell was discovered by Robert Brown in 1831 but the material present inside the nucleus called "nuclein" (DNA) came from the studies of Johann Friedrich Miescher in 1869.

Proteins as a constituent of cell were discovered by the experimental analysis of Gerhardus Johannes Mulder in 1837.

DNA as a genetic material came from the experimental studies of Frederick Griffith in 1928, Oswald Avery, Maclyn McCarty, and Colin MacLeod in 1944, and Hershey and Chase in 1952.

Franklin and Maurice Wilkins are known for their work on the the structure of DNA as they were able to produce high-resolution X-ray photographs of DNA fibres called Photo 51 in 1952 using X-ray diffraction technique. By 1953 Franklin concluded concluded that DNA shows helical structure with phosphates on outer side.

Thus, 1. DNA is found in the nucleus of a cell

2. Organisms store and transmit genetic information

3. Cells contain protein molecules.

are the correct options.

8 0

3 years ago

Read 2 more answers

A unique feature of muscle tissue is that it is capable of

kogti [31]

Answer:

Contraction.

Explanation:

Muscle tissues are defined as they are elastic and extensible in nature. In other words it's also defined as they are able to stretched and returned to its original size and shapes. A unique feature of muscle tissue is they are able of contractile in nature. With the help of this contraction they are able to sliding myosin and actin filaments which are present in muscles tissues.

Basically muscle tissues are three types:

1) Skeletal muscle: They are strong and rapid in contraction.

2) Cardiac muscle: They are strong in contraction.

3) Smooth muscle tissues: They are slow and weak in contraction.

4 0

4 years ago

How many three fourths are in five halves?

marishachu [46]

To know how many $\frac{3}{4}$ are in $\frac{5}{2}$ we can simply divide $\frac{5}{2}$ by $\frac{3}{4}$ .
$\frac{ \frac{5}{2} }{ \frac{3}{4} }$ = $\frac{5*4}{2*3}$ = $\frac{20}{6}$ = $\frac{10}{3}$
final result: 3,3333...

3 0

3 years ago

How do I adjust my model based off of fossil information?

Sindrei [870]

Answer:

Fossil is unable to change

Explanation:

7 0

3 years ago