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4 years ago

What do euglenoids lack? cell walls chloroplasts contractile vacuoles eyespots

Biology

1 answer:

Marianna [84]4 years ago

6 0

Answer:

Euglenoids lack a Cell wall

Explanation:

Euglena is a unicellular photosynthetic protista that can be found in both salt water and fresh water. As Euglena has chloroplasts they can produce their own food through photosynthesis. For their movement in water they have specialized structure called flagella. Near Flagella another pigmented spot exist called eyespot. Eyespot helps euglena to detect sunlight. Euglenoids lack cell wall so they have more flexibility for movement.

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Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"? Sel

Mila [183]

Answer:

Cyclic AMP and calcium may be second messengers.

Explanation:

these are signalling molecules that are located inside the cells,They are releases when cells are in contact with signals from an extracellular molecule. the extracellular molecules that cause the chemical reaction in an external environment in the second messenger are called first messenger.

the basic mechanisms of second messenger involve the binding of ligands to the cell membrane receptors( usually a trans membrane protein).causing conformational change in the receptor protein. The latter change affect the structural and functional activities of the receptors protein with a consequent production of second messenger,

Response of the cells to the first messenger my cause different form of cellular reactions; the cells may undergo depolarization with influx of out flux of ions, differentiate to specialized cells or migrate to another location.

Examples of first messenger are hormones and neurotransmitters, while calcium ions, cyclic GMP,AMP, diaclyglycerol are examples of first messengers.

Most first messengers are peptide hormones.Some may be streroid, However, the hydrophilic nature of the peptide hormone restrict their movement, at the cell membranes. Therefore most first messengers made of peptide are first converted to second messenger to bring about their signalling effects.The usually mark the beginning of cascade events by second messengers.

Second messengers are usually classified based on their polarity and molecular form this include the

hydrophobic molecules ;diacyglecerol,phosphatdylinotisols. These diffuse through the membrane into intramembrane space of cells cause signalling effects in the cell.

the hydrophiliic molecules are located in the cystol of cells. Example are Cylic AMP. GMP, Calcium,

N02, CO,H2S are polar molecules that easily diffuse into the cells to cause signalling effects, they are the third Classification of second messengers.

6 0

3 years ago

Read 2 more answers

Help pls pls pls pls

katrin2010 [14]

3 is b PROKARYOTIC AND EUCARIOTIC

8 0

3 years ago

Mary, age 37, is pregnant for the first time, and her doctor has ordered a series of routine screening procedures. mary’s doctor

Elan Coil [88]

Probably Mary's doctor will not doctor a chronic villus sampling because of her first time pregnancy at the aged of 37 and her doctor ordered so many series of routine screening procedure. The doctor will not order a chronic villus sampling on Mary.

6 0

3 years ago

The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has gre

tresset_1 [31]

Hello. This question is incomplete. Also, you forgot to show the flowchart. The flowchart is attached below and the full question is:

The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has green pods. Green pods are the dominant trait. The flowchart is missing the labels that describe the traits.

In which squares should the phrase “Green pods” appear?

1.A and D 2.B and E 3.A,C and D 4.A,B,C,D and E

Answer:

3.A,C and D

Explanation:

As shown in the question above, the flowchart shows the crossing of a pea plant with dominant features (green pods - AA) and a pea plant with recessive features (yellow features - aa). The crossing between plants with AA and aa alleles generates a completely Aa population, which in this case, has the dominant characteristic, that is, it has green pods. This is because the "Aa" alleles are called heterozygous and develop the dominant characteristic.

As we can see in the flowchart, the crossing between the two pea plants generated an offspring that is identified by table C, as we know this offspring has green pods and in the flowchart it is represented by a grayish rectangle. Therefore, we can say that the other gray rectangles represent pea plants with green pods, which are rectangles A, C and D.

4 0

3 years ago

Cells is an isotonic solution, have no net flow of water show a state of____? A) dynamic equilibrium B) hyposalinity C) active t

tamaranim1 [39]

Answer:

Explanation:

7 0

3 years ago