31. Which of the following structures are derived from endoderm? a. muscles and

Question

31. Which of the following structures are derived from endoderm? a. muscles and bones b. gametes- egg and sperm c. the lining of many endocrine glands d. the brain and spinal cord e. skin and nails 32. In embryology, the 16-cell stage, marked by indeterminate cells and a non-hollow mass, is known as alan a. fetus b. morula c. blastocyst d. gastrula e. primitive streak 33. The beginning of brain and spinal cord formation (thus the nervous system) is termed a. nodal invagination b. organogenesis c. gastrulation d. neurulation e. gametogenesis 34. Movement of a molecule across a membrane, with the aid of a protein or other carrier that does not require cellular energy and moves from an area of high concentration to an area of low concentration, is called: a. osmosis b. diffusion c. active transport d. facilitated diffusion e. all of the above 35. Which organelle is primarily responsible for converting food energy to the energy of ATP? a. mitochondrion b. chloroplast c. lysosome d. golgi body e. nucleolus 36. Stratified squamous epithelium is a. Capable of enduring some abrasion b. Found in the epidermis c. Made up of many layers d. Found in the walls of the vagina e. All of the above 7

Explanation / Answer

31) The structure which is derived from endoderm is the lining of many endocrine glands like thyroid, parathyroid, islets of Langerhans, thymus etc. Therefore, the answer for this question is option c (the lining of many endocrine glands).

Skin and nails are the derivatives of ectoderm. Brain and spinal cord are developed from neuroectoderm. Muscles and bones are derivatives of mesoderm.

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.